In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

Brother-in-law spotted at site where Karen Ristevski’s body dumped

Karen Ristevski's brother-in-law has refused to answer any questions about why he was seen near the site the murdered Melbourne mother's body was dump almost one year since she disappeared.

A Current Affair reporter Martin King was at the bush site where Ms Ristevski's body was dumped last year with former Victorian homicide squad investigator Charlie Bezzina filming a story to mark one year since Ristevski first disappeared.

Vasko Ristevski, the brother of Ristevski's husband Borce, refused to answer any questions as to why he was at the site in the Mt Macedon Regional Park, approximately 60km from the Ristevski's home in Avondale Heights.

Instead of staying to answer questions, Mr Ristevski and a female companion fled.

Ristevski's body was found inside the national park almost eight months after she went missing.

It comes as reports surface of an iPad seized from the family home which had evidence of a Google search on how to detect traces of blood.

There was also search history on how to erase mobile phone data, and a GPS navigator belonging to the family examined by a specialist in the United States, according to a Herald Sun report.

It comes after Victoria Police on Friday released CCTV of a Mercedes Benz SLK coupe, believed to be Ms Ristevski’s, on the day she went missing last June.

The footage captured the black car being driven through Diggers Rest towards the spot where her body was found dumped almost eight months later at Mt Macedon Regional Park.

Further CCTV footage also showed other vehicles of interest that were seen in the area at the time. These include: a white Ford Ranger single-cab ute towing a dual-axle trailer with a yellow mini-excavator on it; a black Holden Commodore ute with a black canopy; a maroon Nissan Patrol wagon with a black roof rack and a spare tyre fixed on its rear door; a white Honda Jazz wagon, and; a silver Kia Rio wagon.

Missing persons squad Detective Inspector Tim Day said he hoped the drivers of the vehicles would come forward with any information.